Next to Vincent van Gogh's Wheat Field with Cypresses at Metropolitan Museum of Art (New York City, June 2011).

Giving plenary presentation at the First The National Map Users Conference (Denver, CO; May 13, 2011)

In front of cherry blossoms at the Tidal Basin in Washington, DC (March 26, 2011).

In front of exhibit about The Mutch Memorial Station on Mars (Air & Space Museum, Washington, DC, March 2011)

At George Bush Library and Museum (Texas A&M University, College Station, TX; October 20, 2010)

The Green Dream Team at the 2010 GreenGov Presidential Awards ceremony (Washington, DC; October 7, 2010)

Holding the Green Dream Team Award citation, 2010 GreenGov Presidential Awards ceremony (Washington, DC; October 7, 2010)

Green Dream Team Award citation, 2010 GreenGov Presidential Awards ceremony (Washington, DC; October 7, 2010)

Nancy Sutley (Chair, Council on Environmental Quality) and Christopher Lu (Assistant to the President) at GreenGov Presidential Awards Ceremony.

With EPA colleagues Pai-Yei Whung (left) and Meghan Radtke (right) in Eisenhower Executive Office Building (Washington, DC; October 7, 2010)

The "Green Dream Team" prior to the 2010 GreenGov Presidential Awards ceremony (Washington, DC; October 2010)

Crossing the finish line at the "LIVESTRONG Challenge - Philly" ride (August 2010)

Early-morning preparations for the "LIVESTRONG Challenge - Philly" ride (August 2010)

With Lance Armstrong's coach, Chris Carmichael, the day before "LIVESTRONG Challenge - Philly" (August 2010).

With George Heartwell, Mayor, Grand Rapids, MI (Chicago, July 15, 2010).

With Ron Sims, Deputy Secretary, US Department of Housing and Urban Development (Chicago, July 15, 2010).

With Dr. Jonathan Patz (Chicago, July 15, 2010)

With Dean Tousley at FEI reunion lunch (Washington, DC; May 2010)

With Carl Smith at FEI reunion lunch (Washington, DC; May 2010)

With his dog, Lucky, at Patuxent National Wildlife Refuge, Maryland (April 2010)

With Testudo before University of Maryland women's basketball game (Comcast Center, February 28, 2010)

In Glasgow, UK, with (left to right) Richard Bellinghman, Michael Blitzer, and Jim McDonald (January 2010)

With Dr. James Curran, Director of Environmental Science, Scottish EPA (January 26, 2010)

In Sherborn, MA (December 2009)

Enjoying the winter snow (Sherborn, MA, December 2009)

At Notre Dame (Paris, November 2009)

In the Tuileries Garden (Paris, 2009)

At Versailles (France, November 2009)

2009 Sea Gull Century, Salisbury, MD (October 10, 2009)

2009 Sea Gull Century, Salisbury, MD (October 10, 2009)

At Wrigley Field, Chicago (September 15, 2009)

Wrigley Field, Chicago (September 15, 2009)

Standing in front of B-17 bomber, "Aluminum Overcast," prior to taking flight (Leesburg, Virginia; August 30, 2009)

View of bombardier's seat in B-17 nose during flight (August 30, 2009)

Sitting in bombardier's seat in B-17 during flight (August 30, 2009)

My dog Lucky (August 8, 2009).

With Amy Freeze (Chief Meteorologist, Fox News Chicago) at the Great Lakes Urban Habitat Restoration Symposium (Chicago, January 2009)

With David Ullrich (Director, Great Lakes Cities Initiative) at the Great Lakes Urban Habitat Restoration Symposium (Chicago, January 2009)

2008 Sea Gull Century (Salisbury, MD)

At Exit Glacier in Seward, Alaska (July 2008)

With Monica Rodia at 8th National Tribal Conference on Environmental Management (Montana, 2008)

With fellow cyclists during Bike Vermont tour in Ireland (June 2008)

With Brian Allen during Bike Vermont tour in Ireland (June 2008)

2008 Five Boro New York Bike Tour (May 2008)

Start of 2008 Five Boro New York Bike Tour (May 2008)

Start of the 2008 cycling season (College Heights, MD)

Start of the 2008 cycling season (College Heights, MD)

Speaking at Pell Center for International Relations and Public Policy (Rhode Island, 2007)

On ferry to Mackinac Island, MI, heading to International Joint Commission meeting (May 23, 2007)

Wind power in Mackinac City, MI (May 2007)

Speaking in plenary session at the 2007 National Summit on Coping with Climate Change (University of Michigan, Ann Arbor, MI)

With Dr. Rosina Bierbaum at the 2007 National Summit on Coping with Climate Change (University of Michigan, Ann Arbor, MI)

With Dr. Jonathan Patz at the 2007 National Summit on Coping with Climate Change (University of Michigan, Ann Arbor, MI)

Exhilaration after finishing 2005 New York Bike Tour (May 1, 2005)

International Water Management Conference, 2004. Scheraga is in second row on far left (Zurich, Switzerland)

With Mayor Daley at Great Lakes Cities Initiative meeting (Chicago, December 12, 2003)

President Ruth Simmons speaking at Horace Mann Award Ceremony (Brown University, 2003)

Dean Karen Newman speaking at Horace Mann Award Ceremony (Brown University, 2003)

Being awarded Horace Mann Medal by Dean Karen Newman during award ceremony (Brown University, 2003)

Presenting lecture during Horace Mann Award ceremony (Brown University, 2003)

With Dr. Ken Reckhow during 2003 International Water Management Conference (Zurich, Switzerland)

With Dr. Ken Reckhow during 2003 International Water Management Conference (Zurich, Switzerland)

Lecturing at 2003 International Water Management Conference (Zurich, Switzerland)

US/China Bilateral meeting on climate change. Scheraga is in back row, sixth from left (Beijing, China, 2003).

US delegation to US/China Bilateral meeting on climate change. Scheraga is fourth from left (Beijing, China, 2003).

With Dr. James Buizer (NOAA) at US/China Bilateral Meeting (Beijing, China, 2003).

Scuba diving with Dr. Dana Focks at WHO meeting on climate change & human health (Barbados, 2002)

Scuba diving (Barbados, 2002)

Dr. Dana Focks scuba diving with Scheraga during WHO meeting on climate change & human health (Barbados, 2002)

Participants at WHO meeting on climate change & human health (Western Samoa, 2000). Scheraga is in second row, second from right.

At U.S. National Assessment meeting, with Dr. Larry Kalkstein, Dr. Ann Fisher, and Dr. Eric Barron (Penn State University, Sept. 10, 1997)

At U.S. National Assessment meeting, with Dr. Larry Kalkstein and Dr. Ann Fisher (Penn State University, September 10, 1997)

At U.S. National Assessment meeting, with Dr. Jim Shortle and Dr. Brent Yarnal (Penn State University, Sept. 11, 1997)

At White House Ceremony to release President Clinton's Climate Change Action Plan (1993).